Overview
A noun is a basic part of speech that typically denotes the name of a person, place, thing, animal, or abstract concept. In grammatical descriptions the idea of a noun is often introduced alongside the phrase "part of speech"; see part of speech for general context. The term name in many introductions is used broadly; compare the more literal sense of "name" at name. Nouns label entities such as a human being, a city, a physical object, or an intangible notion such as justice or time; common examples of entity types are listed at person, place, thing and idea.
Forms and grammatical properties
In languages like English, nouns show grammatical distinctions such as number: singular versus plural (singular and plural). Many nouns also co-occur with determiners or articles that help identify reference; English articles and determiners are discussed under articles and determiners. Nouns typically occupy syntactic positions that differ from those of verbs and adverbs; compare with verbs and adverbs, which have different morphology and syntactic behaviour.
Types of nouns
- Common and proper nouns — common nouns name general classes (city, book), while proper nouns identify unique individuals (Mount Everest, Alice).
- Countable and uncountable nouns — countable nouns can take plural markers (one apple, two apples); uncountable nouns denote substances or abstract mass (water, information).
- Concrete and abstract nouns — concrete nouns refer to perceivable objects (chair, dog); abstract nouns refer to concepts or qualities (freedom, time).
Cross-linguistic variation and history
Although every natural language has ways to refer to people, places and things, the formal category "noun" is realized differently across languages. Some languages mark number with affixes, others use separate words or no marking at all. Articles like English "the" or "a" are absent in many languages; where they exist they function differently. Historically, grammatical categories developed as scholars described patterns of use: early grammarians often began by identifying nouns as words that can be named and modified by adjectives, then refined the concept as syntax and morphology studies advanced.
Functions and examples
Nouns serve several syntactic roles: they can act as subjects, objects, or complements, and they may head noun phrases that include modifiers and determiners. Examples of common noun tokens in modern English include words such as time, people, way, year, government, day, world, life, work, part, number, house, system, company, party, and information. A short list of illustrative phrases: "the city" (proper use of an article), "many books" (plural, countable), "economic growth" (abstract noun in noun phrase).
Notable distinctions and usage notes
Some nouns change meaning with countability (e.g., "light" as an uncountable phenomenon versus "a light" as a lamp). Proper nouns often resist pluralization, though languages differ: several tongues permit plural forms for proper names in special contexts. Pedagogically, learners are usually taught to recognize nouns by distribution (where they occur in sentences), morphology (typical endings in some languages), and semantics (whether the word denotes an entity or concept). For further reading on related grammatical categories and examples, consult introductory resources at part of speech, descriptive entries on English grammar, and comparative grammar overviews available via general linguistics guides (names, person/place/thing, ideas).